Follow-up from #334
## Summary
- align the Electron package `build.appId` with the runtime identifier
already used in `app.setAppUserModelId(...)`
- remove the mismatch between packaged desktop identity and runtime
desktop identity
- keep the change narrowly scoped to identifier consistency only
## Validation
- verified the previous mismatch in `packages/electron-app/package.json`
vs `packages/electron-app/electron/main/main.ts`
- updated the packaging id to match the runtime id exactly
35b171764e